Method of distributing and circulating air for air cleaning tables



June 30, 1931. ARMS 1,812,073

METHOD OF DISTRIBUTING AND CIRCULATING AIR FOR AIR CLEANING TABLES 2 Sheets-Shoat 1 Filed May 18, 1928 June so, 1931. G, L, ARMS 1,812,073

METHOD 0F DISTRIBUTING AND CIRCULATING". .AIR-' FOR AIR CLEANING TABLES Filed May 18; 1928 2 Sheets-Sheet 2 20 ings where=in1 Patented June f ,2 i

, GEORGEIYMAN l mits, or oi ricAGo;

' COMPANY, tor CHICAGO, rnrimois; A ycoxro'nnm on or mutton inEwnoDonmsmRmvmmG ANDCIRCULATING h mronixmiormnm f r Application ijfiled May 18, 192i s eiia kuoizrsflsa '5 My invention relates to improvements in method of distributing and circulatingiairzfor airacleaning tables. It has for "oneobject to provide a new and improved apparatus for 1 and means for controlling and cireiflatingthe air which effects cleaning and separation ithout providinganVexcessiyely great quan' tity of air from-Which dust may be separated before it is discharged intotheoliter at'mQs:

phe-re. Another objectofthe inventionlis to make it possible tonse large volumeshof air.

for 'ooalj olea-ning and treating and to remove the dust from such air ithout separately treating. and Chist cleaning; ltheitotal amount of the. air in the I system; Othero'hjeote will appear; :from timej-ito time throughout the specification and claims.

My inventionis illustratecbmore"or less diagrammatically, in the accompanying draw- Figure 'l is 'adiagrammatic"side'ieleiiation Figure 2 is a; seetion along the line 2-''2'of i.

"Figurel. a, V I 7 Like parts are, indicated bylike ohar acters throughout. r v,

I V irhe oalt e ti ii ret iiiiire i i plant is of the type fwell-known :to, $3,111 wherein there are a plurality of coal; cleaning tables, it being understood that the feoal is i 9 classified as to' size-"before 'be'ingfedtothe tables and eachtable:receives-@0511 mixedwith the refuse as'it comes from the m neof 'asslze foreach tab-1e; conforming to the general 5 character ofthe table. ltfwill beunderstood I that-the table-which treats the small or fine a coal 'p'articlesrequires inueh less air "thanthe tablewghich treate the ooavrerparticlee; the fine coal table "is equip pe iWith a small 1 fine pervious-sc'reen deck otliefithierfltableS as they handle larger {and larger sizes of goal being equipped; with progres siir,ely increii d; I sized sereenslf orrning the decks, lt wil-lf $1113 therbe understoodth'at while ab sr olutelypiire' 5 air'mustbe fecLto. the undereide otthe fine h uvelopity and passes through a continiiou fiy flowing sheet of material .011 "the .dedk. The i supportingmeans A areirqvidedtijfli djllSt 1 a a .a w fendthe J hnkage A s proviiied tQS'up fort thes dek 1 a vh f ii i. rtri'o lvwheel sA feonnecting Afthie wheel; being driyenithrou gha; gear-train A?' irom the fan shafgwhioh iii-11.11.1111 is'driven by ainotor A.v A j isa e d hopperdischaifging throu"11 is fed .to the-coarser fdeekslis not "felt.

the for, all. The table unit comp rises a blower A supplying air under ,pressure' through a' it Ageneraldescriptionoione deekwill ufconduit A to am-{funnel orevas ohiin'ney,Af I

onthennderside o faperviousideek A The I i M air passes thr'oiigh this' deokl-atrelatiyelyh the angle of inclination o :the ohi teA lonto the surfaceofithedeek,'t f

-mixed co al and refuse supplied by any s it able conveyor A 5; It Will be uniieretdo d that v the-Purp e fthedek is'to ,separate the Ieoal r "and-therefuebygravity;r-

liooa tid lbove each'ldeek is iahood Bythere bei g a flexible r'bllowsg B h extendin down hood through the bellows for v the]. admision ofi coal and refuse to be treated and for the discharge of theseparatedooal and refuse;

B? is a suction pipekleading from the top of the a I. have numbered the or number of tablets-might; v

A tableeifriomfrightto left as .l toi Sirloin s'ive, Numherlis 'thel fin gt ,35 jfi g m the otherta b slimi ease in coarse; V nessof-ssoreena id bymaterial'treatedabythem jaml-in'ereasein'airfreqiiirements.from lftofi W thongh'rit will befunderStOQd that. a greater 1 -fromxthej-hood toand'engaging thef eekfltol make a; generally :d usttighft j oirit betweenthe a reciprocating deck; and the fixed hood f1 1 there must be space'betweeh the deck andithe '15: M

C is an air cleaner through which air is drawn to the fan A for table Number 1. In the example which I have shown this table requires 4,000 cubic feet of air. This air is cleaned before it is forced through the screen because if there were dust in the air it would clog the fine screen. The spent air above the table under the hood B is drawn out through the pipe 13 into the dust settling chamber though this chamber mi 'ht be dispensed with if that were desired and then drawn through a suction pipe G which pip-e carries 4,000 feet of air plus the amount of air which enters in through the bellows between the deck and hood on the fine table. This approximately 4,000 feet is drawn into the fan which feeds air to Number 2 table. This table requires 6,000 feet of air, 4,000 plus the makeup air as I prefer to call it, entering between the hood and deck on the line table and comes to the fan through the pipe C The plant to make up the 6,000, that is 2,000 feet less make up enters the fan A for the second table through an adjustable intake opening C The 6,000 feet of air passes up through the pipe A in the funnel and deck to the hood as above pointed out. From the hood B is drawn through the pipe C 6,000 cubic feet of air plus make-up from table Number 2. This 6,000 feet of air is discharged into a makeup manifold C, tl pipe C discharging into the fan associated with Number 3 table. This pipe C discharges 6,000 cubic feet of air. The deck itself needs 9,000. In this case to avoid drawing in an excess of make-up air the dust laden air is recirculated from the hood B associated with Number 3 tablethrough a recirculation pipe C which pipe also discharges into the manifold G This pipe will discharge into the manifold 3,000 feet less make up so that a total of 9,000 feet is discharged to the deck. The control valve C is provided to add if necessary an addiiional supply of air to the make-up manifold to insure that the proper amount f air is fed to the deck. This make-up manifold and control valve is found in connection with tables Nos. 4 and 5 also. I I From the hood B of table N o. 3 is withdrawn through the settling chamber and through the pipe C only 6,000 feet plus make up. 3,000 feet is recirculated between the hood and fan of No. 4 from the pipe C and 8,000 feet is introduced controlled by the valve C to give a total 12,000 feet of air to work the table. From the hood of table No. 4 is drawn 9,000 feet of air through pipe 9 to the make-up manifold of table No. 5. 3,000 feet is recirculated through the pipe C and only 4,000 feet is drawn off through the pipe C to the dust separating apparatus C It will be understood, of course that these amounts are only generally stated. There may be considerable divergents in any particular set of tables between make-up recirculatio-n and transfer from one table to another because this apparatus must be set up to take care of the peculiar characteristics of the coal which is treated and because every operator who adjusts or sets up the plant is likely to make slightly different adjustments from the other but however those adjustments are made, it always results in maintaining that part of the system between the fan and the deck under pressure and the balance of the system under suction so that all leakage is inward. The dust is always thus kept in the system and the dust in the air forced through any table exceptthe smallest one is some of it deposited with the coal passing through the table. The remainder only that which is carried out with the 4,000 feet or relatively small amount fed to the dust separato is the only dust which gets out of the system except with the coal and slate as it is discharged.

Experience shows that there is a limit beyond which the air is enabled to carry dust so that when the air reaches the dust saturated point any additional dust is deposited on the coal or settled out through the settling chambers. The reason for using the settling chambers is to provide means for recovering the coal dust which is valuable and to make it unnecessary to circula e through the system and through the fan large and heavy quantities of dust and to prevent discharging from the tables excessively dusty coal which would be dirty to handle in the plant but as far as the operation of the settling chamber is concerned the dust settling chambers could be dispensed with.

It will be understood that while I have shown a complete system taking care of five differing tables handling coal of five different sizes, nevertheless my system might be applied to a larger or to a smaller number of tables and under some conditions recirculation of the coal between the hood and the fan of every table and under other conditions no recirculation need be used or in other conditions only recirculation at the end of the system might be the best solution.

I claim:

1. The process of cleaning coal by air which consists in forcing a high pressure stream of air through a flowing bed of coal adding a supply of additional air to the dustladen air above the bed, withdrawing the resultant air from above the bed and forcing such air under high pressure through a second flowing bed. of coal the beds of coal as far as the circulation of the air is concerned being arranged in series.

2. The process of cleaning coal by air which consists in forcing a high pressure stream of air through a flowing bed of coal adding a supply of additional air to the dust laden air above the bed, withdrawing the resultant air from above the bed, and recirculatiso ing part of such air through the bed and forcring the remainder through a second flowing bed of coal the beds of coal as faras the cir'-.

culation of-the air is concerned being arranged 1n series. a

3. The process of cleaning coal airwhich" 7 consists in providing a plurality of separate flowing bedjsof coal, forcing'a high pressure stream of air through eaehrbedgadding asupply, of additional air to the dust laden air above each bed, withdrawing theresultan t air from above each bed, recirculatingpart of the air from some of said beds throughthe bed from above where it is withdrawn and forcing the remaining, air from some of said beds through an ad acent bed the beds of.

coal as far as thecir'culat-ion ofthe air is concerned being arranged in series;

4:. The process of cleaning coal by air which consists in providing a plurality of separate flowing beds of coal, forcing a high pressurestream of air through eachbed, adding a supply of additional air to the dust laden air above each'bed, withdrawing the resultant air from above each bed, the air supply to the first bed of the system being substantially free from dust, withdrawing all there'sultant air from above the. first bed and forcingit through the next, bedin the 'system,=witl1- drawing some of the air from'above each other bed in the system and recirculating through the same bed and'withdr'awing some of the air from the last bed in the system and separately removing dust therefrom. I r

5. The process of'cleaning coal by air which consists in providing a plurality of separate flowing beds of coal, forcing a high vpressure stream of air through each bed, adding a supply of'additional air, to the dustladen airv above each bed, withdrawing the resultant air from above each bed, the air supply to the flrstbed of the system being substantially free from dust, withdrawing all the resultant air from above the first bedand forcing, 55 it through the next bed in the system, withdrawing some of the air from" above eachother bed'in the system? and recirculating through the same bed and withdrawing some of the air from the last bed in thesystem and separately removing dust therefrom, and

separating some of the dust from the air" as it travels from above one bed before it is discharged through the next 6. Theprocessof cleaning coal byair which; consists inproviding a' plurality ofseparate,

flowing beds'of coal,-forcing a highjpressure stream of air through each bed, adding a supply of additional air to thedustladen'air above each bed, withdrawing the resultant air from above each bed, recirculating part of V theair from some ofsaid beds through the' bed from above whereit is withdrawnand forcing the remaining air from some of'said beds through an adjacent bed," and addingadditional' make-up air to the air received i 10. The process [of cleaning coal by'air which consists in forcing a stream of? air}. through a flowingbed ofcoal drawing'oif the spent dust laden air from above the bed, 1- c entraininglwith it an additional supply of air, forcing the resultant dust laden air fromi'above d t0 makerupthewproper amount to be discharged to; the next bed, the

stream f air, through eachbed, :adding 'a;

supplyi o'fadditional air to the dust ladenair aboveeach bed, withdrawi'n g the resultant: air

from "above ,eachabed, :the air supply tovthe beds coal Jas farjasfthe;circulationof the air isiconcernedybeingl arranged in series Y 7; The'processof cleaning coal by air which consists in :providing a; plurality? of separate. fiflo'wing beds of :coal, forcing a: high pressure first bed "of the 1 system a being. substantially 'freefromdust,withdrawing'all the'iresultant' s air;fromllabovefthe first bed a'nd forcing it v 1 through the e ated infthe system, with:

drawing some'fiofithe air from above each other bed in the system and-recirculating,

ithroughthe same bed andwithdrawing some or of the air from the last bed inthe system and separately removing dust therefrom, and 'addingadditional make-up air to the air received from above each bed to make up the proper amount to be discharged to the next bed; 8.

,The process of cleaning coal byair which consists in providing a pluralityv of separate above each bed, withdrawing the resultant air free fromdust,withdra wing all the resultant air from above the first bedtandcforcing it through the neXt bed injthe system, with-; drawing some of the airjfrom above each" other bedinqthe system'and recirculating through the same bed and withdrawing some or the airfrom the last bedinthe system and r r I separatelyremoving dust therefrom, and sep aratinglsome of the dust from the airQas it travels from above one'bed'beforefit'is' dischargedthrough the-next, and addingadditional make-up air to the air received from aboveeach bed to make up the proper amount v toibe discharged to the next bed.

9; The process of supplying air for 'an air] i cleaningbed of coal which 'bedi's oneof a plurality of bedsinl anfair cleaning system whereina blastfof air is forced through the bed which consists in obtainin bed to which the air is to befor'ced and.

. partially by drawing fresh air from outside the system the'beds of coal as far as thecirranged in series; 1

I r the'air to 1, form such blast partially'by withdrawing itf "from a separate bed in the system, partially 'fr'or'n 'withdrawing spent air fromabove the a culation of the air is concerned being ar- 1 Q through a second flowing bed of coal, drawing off the dust laden air from above the bed and entraining with it an additional sup- 5 p 1y of air and separating the dust from the air.

11. The process of cleaning coal by air which consists in forcing a stream of air through a flowing bed of coal, drawing off the spent dust laden air from above the bed,

forcing the resultant dust laden air through a second flowing bed of coal, drawing off the dust laden air from above the bed and separating the dust from the air.

Signed at Chicago county of Cook and State of Illinois, this 14th day of May 1928.

GEORGE LYMAN ARMS. 

